Quantifying time spent outdoors: A versatile method using any type of global positioning system

Spending time outdoors is associated with increased time spent in physical activity, lower chronic disease risk, and wellbeing. Many studies rely on self-reported measures, which are prone to recall bias. Other methods rely on features and functions only available in some GPS devices. Thus, a reliab...

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Bibliographic Details
Published in:PloS one 2024-05, Vol.19 (5), p.e0299943
Main Authors: Liu, Wei, Chambers, Timothy, Clevenger, Kimberly A, Pfeiffer, Karin A, Rzotkiewicz, Zachary, Park, Hyunseo, Pearson, Amber L
Format: Article
Language:English
Subjects:
Accelerometers
Chronic diseases
Evaluation
Exercise
Global Positioning System
Health aspects
Methods
Outdoor recreation
Physical fitness
United States
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Summary:Spending time outdoors is associated with increased time spent in physical activity, lower chronic disease risk, and wellbeing. Many studies rely on self-reported measures, which are prone to recall bias. Other methods rely on features and functions only available in some GPS devices. Thus, a reliable and versatile method to objectively quantify time spent outdoors is needed. This study sought to develop a versatile method to classify indoor and outdoor (I/O) GPS data that can be widely applied using most types of GPS and accelerometer devices. To develop and test the method, five university students wore an accelerometer (ActiGraph wGT3X-BT) and a GPS device (Canmore GT-730FL-S) on an elastic belt at the right hip for two hours in June 2022 and logged their activity mode, setting, and start time via activity diaries. GPS trackers were set to collect data every 5 seconds. A rule-based point cluster-based method was developed to identify indoor, outdoor, and in-vehicle time. Point clusters were detected using an application called GPSAS_Destinations and classification were done in R using accelerometer lux, building footprint, and park location data. Classification results were compared with the submitted activity diaries for validation. A total of 7,006 points for all participants were used for I/O classification analyses. The overall I/O GPS classification accuracy rate was 89.58% (Kappa = 0.78), indicating good classification accuracy. This method provides reliable I/O clarification results and can be widely applied using most types of GPS and accelerometer devices.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0299943